Capture and control of emissions is accomplished by creating air movement. Every type of fan design can be used to move air through a filter or process scrubber. The fans can be installed on the clean side of the capture/destruction device which calls for high-efficiency, minimum-power consumption designs. Dirty air fans for capture/destruction devices would require more rugged-duty industrial designs. These capture devices can be designed for continuous operation or shut down regularly for cleaning. Occasionally, the air is corrosive or contains gases that require special fan construction to resist wear. NYB offers several designs.